The results for Centaur C/2011 P2 (PANSTARRS) fit in the general picture of the group: Centaurs with smaller perihelion distance q and semi-major axis a are smaller than those remaining farther from the Sun during their orbital path, thus reinforcing the idea that active Centaurs are "comets in fieri". The coma contribution has been subtracted in order to derive an estimate for the Centaur's diameter of D 16 km, assuming an albedo of A = 0.07 (average of albedo measured within the Centaur group). Results: Centaur C/2011 P2 (PANSTARRS) shows a faint but still detectable comet-like activity, which accounts for more than 50% to the observed brightness. Methods: We analysed visible images of the Centaur taken at the TNG telescope in the R filter to investigate the level of coma contributing to the target brightness and to derive information on its nucleus size. such as SDSS (Abazajian et al.2003) and PanSTARRs (Chambers et al.2016).Kosakowski et al.(2020) ex-panded the ELM Survey into the southern sky using photometry from SkyMapper (Onken et al.2019. 2 Johns Hopkins University, Baltimore, MD. The observations were obtained in the framework of a wider program on Centaurs aimed at searching for comet-like activity in several targets outside Jupiter's aphelion. 1 Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive. The current astrometric accuracy of PanSTARRS catalog has been achieved using a general purpose pipeline and referencing to the 2MASS catalog. 2008 International Astronomical Union doi : 10.1017 / S1743921308020139 The extended solar neighborhood : precision astrometry from the Pan - STARRS 1 3. Aims: In this paper we present observations of the active Centaur C/2011 P2 (PANSTARRS), showing a compact comet-like coma at the heliocentric distance of r h = 9 au.
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